Fellow Aiden Batch Flat Bottom vs April Flat Bottom Paper

Fits

Flat basket

Flow

Unknown · Unknown

Material

Paper · Cellulose

Reuse

Single-use

Availability

In production

How it brews

The flat-bottom batch paper for Fellow's Aiden, sized for 8-12 cup brews in the flat-basket family. The wide, flat bed is the batch-brew geometry; it fits flat-basket seats and interchanges with other basket papers of that fit, not with the Aiden's single-serve cone. Fellow publishes no flow class, so we leave flow unrated. It's an everyday single-use paper with no special care beyond seating it flat.

Fits

Flat basket, Kalita Wave 155, Kalita Wave 185

Flow

Fast · Manufacturer-stated

Material

Paper · Cellulose

Reuse

Single-use

Availability

Specialty only

How it brews

The Copenhagen roastery's own flat-bottom paper, sold Small (≈Kalita 155 / Origami S) and Large (size 175, for the April plastic brewer). It's cut to sit deep with a wide base and is marketed as flowing faster than conventional flat papers — that speed claim is April's, kept as a class rather than a number here. One honest ambiguity: older retailer copy described April filters as using Sibarist's abaca FAST technology, while the current listing says virgin wood pulp (cellulose); we record cellulose per the direct listing but don't treat abaca as confirmed. It drops into a Kalita Wave 155/185 seat, so it interchanges with those papers.